protected SIPMessage(
	List<Header> headers,
	string body = null
)

Protected Sub New ( 
	headers As List(Of Header),
	Optional body As String = Nothing
)

protected:
SIPMessage(
	List<Header^>^ headers, 
	String^ body = nullptr
)

new : 
        headers : List<Header> * 
        ?body : string 
(* Defaults:
        let _body = defaultArg body null
*)
-> SIPMessage